Formatted question description: https://leetcode.ca/all/1732.html

1732. Find the Highest Altitude

Level

Easy

Description

There is a biker going on a road trip. The road trip consists of n + 1 points at different altitudes. The biker starts his trip on point 0 with altitude equal 0.

You are given an integer array gain of length n where gain[i] is the net gain in altitude between points i and i + 1 for all (0 <= i < n). Return the highest altitude of a point.

Example 1:

Input: gain = [-5,1,5,0,-7]

Output: 1

Explanation: The altitudes are [0,-5,-4,1,1,-6]. The highest is 1.

Example 2:

Input: gain = [-4,-3,-2,-1,4,3,2]

Output: 0

Explanation: The altitudes are [0,-4,-7,-9,-10,-6,-3,-1]. The highest is 0.

Constraints:

  • n == gain.length
  • 1 <= n <= 100
  • -100 <= gain[i] <= 100

Solution

Start from altitude 0 and calculate altitudes at all indices. Maintain the highest altitude during the process. Finally, return the highest altitude.

  • class Solution {
    public int largestAltitude(int[] gain) {
        int maxAltitude = 0;
        int altitude = 0;
        int length = gain.length;
        for (int i = 0; i < length; i++) {
            altitude += gain[i];
            maxAltitude = Math.max(maxAltitude, altitude);
        }
        return maxAltitude;
    }
}

  • // OJ: https://leetcode.com/problems/find-the-highest-altitude/
// Time: O(N)
// Space: O(1)
class Solution {
public:
    int largestAltitude(vector<int>& A) {
        int h = 0, ans = 0;
        for (int n : A) ans = max(ans, h += n);
        return ans;
    }
};

  • # 1732. Find the Highest Altitude
# https://leetcode.com/problems/find-the-highest-altitude/

class Solution:
    def largestAltitude(self, gain: List[int]):
        res = [0]
        for g in gain:
            res.append(res[-1] + g)
        
        return max(res)

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